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- #ifndef __SOUND_I2C_H
- #define __SOUND_I2C_H
- /*
- *
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- *
- */
- #define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
- struct snd_i2c_device {
- struct list_head list;
- struct snd_i2c_bus *bus; /* I2C bus */
- char name[32]; /* some useful device name */
- unsigned short flags; /* device flags */
- unsigned short addr; /* device address (might be 10-bit) */
- unsigned long private_value;
- void *private_data;
- void (*private_free)(struct snd_i2c_device *device);
- };
- #define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
- struct snd_i2c_bit_ops {
- void (*start)(struct snd_i2c_bus *bus); /* transfer start */
- void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
- void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
- void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
- int (*getclock)(struct snd_i2c_bus *bus);
- int (*getdata)(struct snd_i2c_bus *bus, int ack);
- };
- struct snd_i2c_ops {
- int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
- int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
- int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
- };
- struct snd_i2c_bus {
- struct snd_card *card; /* card which I2C belongs to */
- char name[32]; /* some useful label */
- struct mutex lock_mutex;
- struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
- struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
- struct list_head devices; /* attached devices to this bus */
- union {
- struct snd_i2c_bit_ops *bit;
- void *ops;
- } hw_ops; /* lowlevel operations */
- struct snd_i2c_ops *ops; /* midlevel operations */
- unsigned long private_value;
- void *private_data;
- void (*private_free)(struct snd_i2c_bus *bus);
- };
- #define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
- int snd_i2c_bus_create(struct snd_card *card, const char *name,
- struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
- int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
- unsigned char addr, struct snd_i2c_device **rdevice);
- int snd_i2c_device_free(struct snd_i2c_device *device);
- static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
- {
- if (bus->master)
- mutex_lock(&bus->master->lock_mutex);
- else
- mutex_lock(&bus->lock_mutex);
- }
- static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
- {
- if (bus->master)
- mutex_unlock(&bus->master->lock_mutex);
- else
- mutex_unlock(&bus->lock_mutex);
- }
- int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
- int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
- int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
- #endif /* __SOUND_I2C_H */
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